与
中的“l”关系密切的是（ ）
A．质子数、电子总数
B．元素化学性质、化合价
C．物质状态、电子层数
D．原子结构、中子数
答案：B
He said he had stolen the money but he couldn't _____ the fact that the money was found in his house. [ ]
A. answer for
B. leave for
C. account for
D. care for
农田灌溉渠道排放工业废水和城市污水，应保证其下游（）的灌溉取水点的水质符合农田灌溉水质标准。
A、最远
B、最近
C、所有
D、灌溉水用量最大
